Connection System III

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Connection System III
This is a hybrid between Connection System I and Connection System II.
http://www.thingiverse.com/thing:213821
http://www.thingiverse.com/thing:213819
It is designed to work with my extrusion.
http://www.thingiverse.com/thing:213749
It is a push fit system with does not require any screws. It is possible to build L, T and corner connections.
NOTES:
We are planning to get many of these parts molded so "makers" can buy em cheap and use for their projects. We need your feedback --

1. What other parts would you like added to the library?
2. What colors should different parts be molded in?
3. What would you build with it?
4. Would you like any parts modified?
   We welcome other comments and suggestions